"They're preparing for nightmare situations that have become all too real in the United States," Rob Schmitt reported on "Happening Now."

He noted that in many attacks, authorities later realize that some deaths were preventable. In the June massacre at the Pulse nightclub in Orlando, an 18-year-old named Akyra Murray died of a single gunshot wound to her arm.

Murray slowly bled to death in a bathroom, texting her parents as she waited hours for paramedics to arrive.

At the training session, a doctor explained to the audience that if someone around Murray had known these simple life-saving techniques, she would have lived.

"Stop the Bleed" was started after the 2012 Sandy Hook Elementary School massacre. To learn more about the classes and these life-saving tips, go here.

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